{{I should be answering this privately, but can’t, bc you’re on anon. I do know some things about RP, but I am in no way an authority on it. Ask a few RPers for their definitions. Anyone can reblog this and add their comments, too.}}

One thing is for sure: Don’t make a public list of people you plan to RP with. It can make the not-listed people feel left out and can lead to you getting anonhate. You can do what you like privately, of course! Make all the lists you want privately. 

Now, it’s fine to make a tag list AFTER you have been RPing and have multiple muse interactions, it’s a nice way to organize your threads and give your readers/followers a way to look on your blog for certain interactions ;]

“selective” means that you only RP with mutuals (ppl who you follow & who also follow you).

“semi-selective” means you RP mainly with mutuals, but are open to others on a case-by-case basis. 

In my blog’s description I have: “Sometimes a selective Ask blog” which I wrote before I knew the fandom definition of “selective.” I was/am using that in the normal context of the word, meaning that I will sometimes answer things as my muse RP, if it feels appropriate.